C1111233131211111211113313331333133313232313331333131111211322121   >>    C111123313121111121111331333133313331323231333133313111121132212   <<    C1111233131211111211113313331333133313232313331333131111211322123   >>      C1111233131211111211113313331333133313232313331333131111211322122   >>